Why did my boyfriend change?

So me and my boyfriend have been going out for a long time now. And just over the past few days he's been acting really weird and not talking to me...
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So me and my boyfriend have been going out for a long time now. And just over the past few days he's been acting really weird and not talking to me as much, then today he came on facebook and said we needed to talk and I asked him to call me, he wouldn't call me, iasked him to hang out and talk he said he was away and I know he's not. then he was saying that he doesn't want to take the responsiblity of being commited. And how this has been way more then what he planned. and he doesn't want a relationship. he tells me this just today, and the everysingle day he tells me he loves me,and how much I mean to him and he doesn't know what he would do with out me.. I don't understand how did everything just change! what do I do I'm so confuzzed!